Brake MOT Failure

[spasimodo]

During the MOT test my 172 phase 2 blew a brake pipe. Brake fluid pissing out under the car nearside front. Apparently the test gear senses the weight of the car and applies extra pressue during the brake tests. Having carefully limped the short distance home I find that the brake pipe has perished high up inside the wheel arch liner where it is supported by a plastic bracket it clips on to, so a new line is needed. I have a mechanic aquaintance who has the necessary kit, copper line and flaring tools etc, but the master cylinder looks very hard to get at, hidden beneath the fluid reservoir. So my question is, what's the best way to replace the line. Is the master cylinder accessible from below or what?
Thanks spaz.

 

[Louis]

You sure it's not blown to the abs unit and front caliper?

 

[Yarp]

As @Louis says it’s unlikely to be one to the MC.

Best pic I can find is below, but the lines come away from the MC behind all the heat shield and sound deadening stuff and into the ABS pump. They then go off to each wheel from there. If it’s leaking NSF then it’ll be that section. I can’t remember if there’s another joint where it goes into the arch or not now though.